Does ProGuard support Java 11?

Question

I was trying to use Proguard (6.1.0beta1) but got

(Unsupported version number [55.0] (maximum 54.0, Java 10)))

Are there alternatives to ProGuard which can manage with Java 11?

Can you compile your code for Java 10? Are you really using the features of Java 11? — Peter Lawrey, Nov 26 '18 at 10:10
Hint: try looking into release letters. Such tools typically tell you exactly which version of Java they are supporting. — GhostCat, Nov 26 '18 at 10:11
And of course: asking for **tools recommendations** renders your question off topic. So better drop that part from your question. — GhostCat, Nov 26 '18 at 10:12
The exception already tells you it is not supported, so why post the question? — Mark Rotteveel, Nov 26 '18 at 10:51

simon04 · Answer 1 · 2019-01-11T07:47:31.150

27

As a follow-up for Karol Dowbecki's answer: ProGuard 6.1.0 beta2 (or newer) supports Java 10, 11 and 12. See #188 Support Java 11

Notice that you'll need to change the libaryjars for Java 9 or newer due to the introduction of the module system. Here's the section of my Gradle Kotlin build script:

if (JavaVersion.current().isJava9Compatible) {
    libraryjars(System.getProperty("java.home") + "/jmods")
} else {
    libraryjars(System.getProperty("java.home") + "/lib/rt.jar")
}

edited Jan 11 '19 at 07:47

answered Jan 11 '19 at 07:24

simon04

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I'm facing problems making proguard compatible due to the module system. https://stackoverflow.com/questions/55609008/meta-inf-version-duplicate-error-when-using-proguard. Where exactly do I make the appropriate changes in build.gradle file to account for this and what do I change/add "? – anirudh Apr 10 '19 at 15:00
Looks like Java 12 support is still lacking from 6.1.0 beta 2 according to ProGuard issue #190. Linking my comment from it here: https://sourceforge.net/p/proguard/feature-requests/190/?limit=25#81a0. There is no mention of Java 12 in the source code at all. – gonadarian May 08 '19 at 21:33

score 7 · Accepted Answer · answered Nov 26 '18 at 10:09

7

Java 11 have introduced changes to the bytecode and class file format:

Because of above it's unlikely that you will find a working code obfuscator at the moment. Hopefully ProGuard will be updated soon (see #188 Support Java 11 planned for ProGuard 6.1).

answered Nov 26 '18 at 10:09

Karol Dowbecki

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I would suggest compiling for Java 10. +1 – Peter Lawrey Nov 26 '18 at 10:10
it seems I have to do this. – tomasz-mer Nov 26 '18 at 10:15
Another thing you could do is take out a support contract - https://www.guardsquare.com/en/support. This will help them find the resources to add new features to your preferred obfuscator ... faster. (Disclaimer: I have no connection or financial stake in GuardSquare or the ProGuard product.) – Stephen C Nov 26 '18 at 11:01

Does ProGuard support Java 11?

2 Answers2